Solar Panel Installation in the UK: Process and Pricing Explained
Installing solar panels is one of the best ways to reduce your energy bills, increase your home’s efficiency, and cut your carbon footprint. But if you’re new to renewable energy, you may be wondering: how does solar panel installation work, and how much does it cost in the UK?
This guide walks you through the installation process from start to finish, explains what’s involved, and breaks down the average costs you can expect.
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How Much Does Solar Panel Installation Cost?
| System Size | Roof Space Needed | Avg. Cost (incl. installation) | Suitable For |
|---|---|---|---|
| 3kW | ~20 m² | £5,000–£6,000 | Small homes |
| 4kW | ~25 m² | £6,000–£7,500 | Average homes |
| 5kW | ~30 m² | £7,500–£9,000 | Larger homes |
| 6kW | ~35 m² | £9,000–£11,000 | Large households |
Factors That Influence Installation Costs
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System Size (kW capacity) – Larger systems generate more energy but cost more upfront.
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Panel Type – Monocrystalline panels are more efficient but more expensive than polycrystalline.
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Roof Type – Complex roofs (steep, shaded, or requiring structural work) increase installation costs.
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Location – Labour costs vary slightly across the UK.
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Additional Features – Extras such as inverters, smart meters, or battery storage raise the price.
The Solar Panel Installation Process
Understanding the installation process can make the experience smoother. Here’s what happens when you install solar panels in the UK:
1. Site Survey and Assessment
Your installer will visit your property to assess:
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Roof condition and angle
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Shading from trees or buildings
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Available roof space
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Energy consumption patterns
This ensures your system is correctly sized and positioned for maximum efficiency.
2. System Design and Quote
After the survey, you’ll receive a custom system design and quotation. This includes the number of panels, inverter choice, estimated generation, and projected savings. Always compare multiple quotes before choosing an installer.
3. Permits and Paperwork
In most cases, solar panels are considered “permitted developments” in the UK, meaning you don’t need planning permission. Exceptions include listed buildings and conservation areas. Your installer will also handle grid connection applications and MCS certification paperwork.
4. Installation Day
On the day of installation:
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Scaffolding is erected for safe roof access.
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Mounting frames are fixed securely to your roof.
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Solar panels are attached to the frames.
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Wiring is connected to the inverter and your home’s electrical system.
Most residential installations take 1–2 days depending on system size and roof type.
5. Inverter and Battery Connection
The inverter converts the DC electricity generated by panels into AC electricity for home use. If you’ve opted for a battery, it will also be installed and connected at this stage.
6. System Testing and Commissioning
Your installer will test the system to ensure everything is working correctly. Once verified, your solar system is commissioned and ready to generate clean electricity.
7. Certification and SEG Registration
After installation, you’ll receive an MCS certificate, which proves your system meets UK quality standards. This is essential for registering with the Smart Export Guarantee (SEG) to sell excess electricity back to the grid.
How Long Does Installation Take?
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Site survey and design: 1–2 weeks
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Permits and approvals: Usually within 2–4 weeks
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Installation: 1–2 days
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Certification and grid connection: Within a few days
Overall, the process from enquiry to completion typically takes 4–6 weeks.
What Savings Can You Expect After Installation?
- Bill Savings: A typical 4kW system can save £400–£600 per year on electricity bills.
- SEG Payments: Selling unused electricity can earn £100–£200 annually.
- Payback Time: Most UK households recover their investment in 8–12 years, with panels lasting 25+ years.
Benefits of Professional Installation
- Warranty protection – Panels and inverters come with long warranties (10–25 years).
- MCS certification – Required to access SEG payments.
- Safety and compliance – Qualified installers ensure your system is fitted correctly and safely.
- Optimised performance – Panels are positioned and connected for maximum efficiency.
Solar panel installation in the UK is now faster, more affordable, and more efficient than ever. While the average system costs £5,000–£11,000, government incentives such as 0% VAT and the Smart Export Guarantee make the investment even more worthwhile.
The installation process is straightforward – from site survey to final commissioning – and most homes can start generating clean electricity within weeks. With significant savings on energy bills, a payback period of under 12 years, and panels lasting 25 years or more, now is an excellent time to install solar panels.
At SolarPanels.co.uk, we connect you with trusted MCS-certified installers who can provide tailored quotes for your home. Start your journey towards cheaper, greener energy today.